Pirelli Tyre S.p.a.

Pirelli Pneumatici S.p.a.

Daniele Lorenzetti

Gianfranco Colombo

Roberto Bolzoni

Stefano Bizzi

Alessandro Castellini

Claudio Minoli

Tommaso Pizzorno

Fabio Montanaro

Federico Mancosu

Maurizio Boiocchi

Mario Secchi

Elda Gelosa

Laura Canevini

Ciro Raia

A tyre having a tread is described. The tyre has a central portion located across an equatorial plane, a first shoulder portion located towards an outer side of the tyre and a second shoulder portion located towards an inner side of the tyre. The central portion is separated from the first shoulder portion by two first circumferential grooves. The first shoulder portion and the second shoulder portion have a plurality of first transverse grooves having a first end located substantially at the respective edge of the tread, having a width greater than or equal to about 4 mm and an axial extension equal to at least 50% of the width of the shoulder portion in which they are located.

Car tyre

Tyre () for heavy load vehicle wheels, having a tread band () comprising: &#x2014;a plurality of circumferential grooves (); &#x2014;a plurality of transverse grooves () extending between two axially consecutive circumferential grooves (), thus defining a plurality of blocks (); &#x2014;each block () comprising a radially outer top surface () and having a height (M) measured between said top surface and a bottom surface of a respective transverse groove (); &#x2014;said transverse grooves () comprising a first segment () having a width Land a second segment () having a width L, where L&#x3c;L; &#x2014;said first segment () being at least partially delimited by walls of two circumferentially consecutive blocks (); &#x2014;at least one filling element () contained within said first segment (); &#x2014;said at least one filling element () having a radially outer top surface (), located radially inwardly relative to said top surface () of the block at a radial distance (D) between 5% and 50% of the height (M) of the blocks (); &#x2014;the plan surface area (A) of said top surface () of said at least one filling element () being greater than 60% of the plan surface area (Ai) of said first segment (); &#x2014;said at least one filling element () being spaced apart from said walls () along at least 70% of its perimeter (P).

Tyre for heavy load vehicle wheels

Tire

Car tire

A safety support for mounting on a rim of a vehicle wheel within a tire includes a substantially toroidal hollow annular body and a filling of elastically deformable expanded material. The annular body includes a convex radially outer surface, two axially opposite side surfaces, and devices for associating the annular body to the rim. The annular body is made of a rigid and substantially non-extensible material and is elastically deformable under load for absorbing stresses imparted to the tire in case of pressure loss by the tire. Each side surface is connected to the radially outer surface by respective first axially opposite connecting portions. A safety system for the vehicle wheel includes a tire and the safety support. The vehicle wheel includes the tire, the safety support, and the rim.

Safety support for a vehicle wheel and safety system and vehicle wheel including the safety support

A mould for producing a tire includes a crown and at least two cheeks. The crown includes radially-movable sectors. A first cheek is axially opposite a second cheek. The mould includes a main profile in a plane of a meridian section. The main profile includes a maximum chord, a maximum height measured from a fitting line, a profile of the first and second cheeks, and a base profile of a sector. The base profile includes first and second lateral portions, first and second connecting portions, and a central portion. The first lateral and connecting portions are axially opposite the second lateral and connecting portions. Each cheek profile includes first and second portions including first and second radii of curvature, where a ratio of the first radius of curvature to the second radius of curvature is greater than or equal to 0.45:1 and less than or equal to 0.56:1.

Mould for producing a tire

Growing community of inventors

Milan, Italy

Daniele Lorenzetti